Suspension bridge cable clamp hoisting construction method

Abstract

The invention relates to a suspension bridge cable clamp hoisting construction method. The method comprises the steps that main cable erecting construction is conducted; a temporary restraining device is installed between the portal supporting cable and the main cable, and the portal supporting cable is pulled down to the designed position; the crane for hoisting the cable clamp is moved to the designed position of the cable clamp of the main cable through a winch, and the cable clamp and the main cable are fixed; and dismantling the temporary restraint device. According to the method, before the main cable clamp is installed, the temporary restraining device is firstly used for pulling down the portal supporting cable to the designed position, a restraining point is provided for the portal supporting cable, the calculated span of hoisting and walking of the crown block on the portal supporting cable is reduced, then vertical deformation of the portal supporting cable caused when the crown block walks on the portal supporting cable is reduced, and the safety of the crown block is improved. The aerial operation height of the traction system is reduced, and the cable clamp is convenient to hoist and install.

Description

Technical Field

[0001] The present application relates to the technical field of main cable construction of suspension bridges, and in particular to a method for hoisting and constructing a cable clamp of a suspension bridge. Background Art

[0002] With the development of technology and the need to cross rivers, lakes and seas, more and more suspension bridges have been built, and the main spans are constantly breaking through. In the process of main cable clamp construction of large-span suspension bridges, the traditional construction method is to use a crane to hoist the cable clamps on the gantry support cable in sequence; but as the span of the bridge becomes larger and larger, the cable force of the gantry support cable is greater during the crane hoisting operation, which is difficult to control and has high safety risks; at the same time, the gantry support cable has different vertical deformation sensitivities at the top of the tower and the mid-span under the action of load. In order to meet the lifting clearance requirements in the mid-span area, it is necessary to reduce the verticality of the gantry support cable, increase the cable force, and increase the lifting height of the cable clamps in other parts, resulting in a large number of chain hoists required for lowering and positioning, a high aerial operation height, inconvenient operation, and high safety risks. Summary of the invention

[0003] The present application provides a suspension bridge cable clamp hoisting construction method, which can solve the problems in the related art that the span and cable force of the gantry support cable are large and the operation is inconvenient when installing the main cable clamp.

[0004] The present application provides a suspension bridge cable clamp hoisting construction method, which includes:

[0005] Carry out main cable installation work;

[0006] Install a temporary restraint device between the gantry support cable and the main cable, and pull the gantry support cable down to the designed position;

[0007] Use the winch to move the overhead crane for hoisting the cable clamp to the designed position of the cable clamp on the main cable, and fix the cable clamp to the main cable;

[0008] Remove temporary restraints.

[0009] In some embodiments, the temporary restraint device is provided at the centerline position of the bridge span of the portal support cable;

[0010] Pulling the portal frame support cable down to the designed position specifically includes: pulling the portal frame support cable down to the designed position at the center line of the bridge span.

[0011] In some embodiments, when a winch is used to move a crane for hoisting the cable clamp to the designed position of the cable clamp on the main cable, the cable clamps can be hoisted asynchronously at the same time on the half spans on both sides of the center line of the bridge span.

[0012] In some embodiments, before installing a temporary restraining device between the portal support cable and the main cable, the method further comprises:

[0013] Get the design position to meet the clearance height between the overhead crane and the main cable during the process of lifting the cable clamp;

[0014] Obtain the tension required by the temporary restraint device when pulling the portal frame support cable down to the designed position.

[0015] In some embodiments, obtaining the design position specifically includes:

[0016] Based on the unstressed cable length of the gantry support cable between the main tower and the center line of the bridge span and the preset coordinate point, the linear equation of the gantry support cable at the preset coordinate point under the overhead crane hoisting movement is obtained;

[0017] Based on the linear equation of the gantry support cable, the clearance height interval between the cable clamp and the main cable is extracted;

[0018] Similarly, the clearance height interval between the cable clamp and the main cable corresponding to different preset coordinate points is obtained;

[0019] Among multiple clearance height ranges, select an optimal clearance height between the overhead crane and the main cable during the cable clamp lifting process, and set the preset coordinate point corresponding to the optimal clearance height as the design position for pulling down the gantry support cable.

[0020] In some embodiments, based on the stress-free cable length of the gantry support cable between the main tower and the center line of the bridge span and the preset coordinate points, the maximum horizontal force N of the gantry support cable during the overhead crane hoisting cable clamp process is also obtained.

[0021] In some embodiments, the temporary restraint device includes: an oblique cable and a vertical cable;

[0022] Obtain the tension required by the temporary restraint device when pulling the gantry support cable down to the designed position, including:

[0023] Based on the design position of the gantry support cable pull-down, the stress-free cable length of the gantry support cable between the main towers and the formula of the single-load suspension cable, the pull-down force T required to pull the gantry support cable down to the design position is obtained;

[0024] Based on the downward tension T, the maximum horizontal force N of the gantry support cable during the overhead crane hoisting cable clamp and the mechanical equilibrium equation, the tension force of the inclined cable and the tension force of the vertical cable are obtained.

[0025] In some embodiments, two inclined cables are provided on the gantry support cables between the main towers;

[0026] The horizontal force of a single inclined cable balances the maximum horizontal force N of the portal frame support cable, and the vertical force of the two inclined cables and the combined force of the vertical cables balance the downward tension T.

[0027] In some embodiments, a winch is used to move a crane for hoisting the cable clamp to a designed position of the cable clamp on the main cable, and the cable clamp is fixed to the main cable, specifically including:

[0028] Use the winch and winch wire rope to move the overhead crane for hoisting the cable clamp to the designed position of the cable clamp on the main cable;

[0029] Use the chain hoist to adjust and position the cable clamp.

[0030] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0031] The embodiment of the present application provides a method for hoisting and installing a cable clamp of a suspension bridge. Before installing the main cable clamp, a temporary restraint device is first used to pull the gantry support cable down to the designed position, providing a restraint point for the gantry support cable, thereby reducing the calculated span of the overhead crane when hoisting and traveling on the gantry support cable. By pre-tensioning the gantry support cable, the vertical deformation of the gantry support cable when the overhead crane travels on the gantry support cable is reduced, the cable force and the sag of the gantry support cable are reduced, and the lifting clearance height is controlled within a range that is convenient for operation, thereby improving safety while increasing convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present application;

[0034] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0035] Figure 3 for Figure 1 A schematic diagram of the partially enlarged structure at B in the middle;

[0036] Figure 4 A schematic diagram of the decomposition of the tension of the gantry support cable provided in the embodiment of the present application;

[0037] Figure 5 A schematic diagram of the tension provided by the temporary restraint device provided in an embodiment of the present application;

[0038] Figure 6 A flow chart of the suspension bridge cable clamp hoisting construction method provided in an embodiment of the present application.

[0039] In the figure: 1. Main cable; 2. Gantry support cable; 3. Vertical cable; 4. Oblique cable; 5. Bridge span center line; 6. Catwalk cable; 7. Overhead crane; 8. Cable clamp; 9. Chain hoist; 10. Winch wire rope; 11. Main tower. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] The embodiment of the present application provides a method for hoisting and constructing a cable clamp for a suspension bridge, which can solve the problems in the related art that the span and cable force of the gantry support cable are large, and the operation is inconvenient when installing the main cable clamp.

[0042] With the development of technology and the need to cross rivers, lakes and seas, more and more suspension bridges have been built, and the main spans are constantly breaking through. In the process of main cable clamp construction of large-span suspension bridges, the traditional construction method is to use a crane to hoist the cable clamps on the gantry support cable in sequence; but as the span of the bridge becomes larger and larger, the cable force of the gantry support cable is greater during the crane hoisting operation, which is difficult to control and has high safety risks; at the same time, the gantry support cable has different vertical deformation sensitivities at the top of the tower and the mid-span under the action of load. In order to meet the lifting clearance requirements in the mid-span area, it is necessary to reduce the verticality of the gantry support cable, increase the cable force, and increase the lifting height of the cable clamps in other parts, resulting in a large number of chain hoists required for lowering and positioning, a high aerial operation height, inconvenient operation, and high safety risks.

[0043] In view of the problem that the span and cable force of the gantry support cable are large and the operation is inconvenient when installing the main cable clamp, the embodiment of the present application provides a suspension bridge cable clamp hoisting construction method, which includes:

[0044] 101: Carry out installation work of main cable 1;

[0045] 102: Install a temporary restraint device between the portal support cable 2 and the main cable 1, and pull the portal support cable 2 down to the designed position;

[0046] 103: Using a winch, move the overhead crane 7 for hoisting the cable clamp 8 to the designed position of the cable clamp on the main cable 1, and fix the cable clamp 8 to the main cable 1;

[0047] 104: Remove temporary restraints.

[0048] In this application, the main cable 1 is installed; then a temporary restraint device is installed between the gantry support cable 2 and the main cable 1, and the gantry support cable 2 is pulled down to the designed position; then the overhead crane 7 for hoisting the cable clamp 8 is moved to the designed position of the cable clamp 8 on the main cable 1 by a winch, and the cable clamp 8 is fixed to the main cable 1; finally, the temporary restraint device is removed. Therefore, before installing the cable clamp 8, the gantry support cable 2 is first pulled down to the designed position by a temporary restraint device, providing a restraint point for the gantry support cable 2, reducing the calculated span of the overhead crane 7 hoisting on the gantry support cable 2, and by pre-tensioning the gantry support cable 2, the vertical deformation of the gantry support cable 2 when the overhead crane 7 is running on the gantry support cable 2 is reduced, the cable force and sag of the gantry support cable 2 are reduced, and the hoisting clearance height is controlled within a convenient operating range, improving safety while increasing convenience.

[0049] Among them, when installing the main cable 1, it is necessary to install catwalk cables 6, handrail cables, gantry support cables 2 and main cable traction systems. The catwalk is a temporary linear construction path erected under the main cable 1 and parallel to the main cable 1 during the construction of the suspension bridge. It is an aerial scaffolding for construction workers to carry out construction work, and is a construction platform for the main cable 1 system and even the entire superstructure of the suspension bridge. Construction workers complete important tasks such as cable strand traction, strand adjustment, shaping into saddles, cable tightening, cable clamps 8 and sling installation, box girder hoisting and site connection, main cable 1 winding, protective coating, etc. There is one upstream and one downstream, and the cross-section is usually U-shaped, narrow and long, and there is some shaking, so it is called a "catwalk". It is an extremely important temporary facility in the construction of suspension bridges and will be removed after the completion of the bridge.

[0050] It should be noted that the temporary restraint device is arranged at the bridge span centerline 5 of the gantry support cable 2. The bridge span centerline 5 divides the gantry support cable 2 between the main towers 11 and 11 into two parts, that is, Figure 1 The two parts ① and ② are symmetrically arranged relative to the bridge span centerline 5. In this embodiment, the original span ① between tower tops, whose length is L, is changed to two sections ② with the bridge span centerline 5 as the endpoint, whose length is 1 / 2L.

[0051] In this embodiment, the temporary restraint device includes: an inclined cable 4 and a vertical cable 3, the vertical cable 3 is arranged between the portal support cable 2 and the main cable 1 along the center line 5 of the bridge span, and the top of the inclined cable 4 and the top of the vertical cable 3 are at the same point on the portal support cable 2, that is, the contact point between the top of the inclined cable 4 and the portal support cable 2 and the contact point between the top of the vertical cable 3 and the portal support cable 2 are at the same position. Further, in this embodiment, the angle between the inclined cable 4 and the vertical cable 3 is set to 45°.

[0052] On the basis of the above-mentioned embodiment, in this embodiment, in step 102: pulling down the portal frame support cable 2 to the designed position specifically includes: pulling down the portal frame support cable 2 to the designed position at the position of the bridge span centerline 5.

[0053] In this embodiment, a temporary restraint device is installed at the gantry support cable 2 at the span centerline position, so that the gantry support cable 2 can be pulled down to the designed position at the span centerline 5, thereby pulling down the entire gantry support cable 2.

[0054] On the basis of the above embodiment, in this embodiment, before installing the temporary restraining device between the gantry support cable 2 and the main cable 1, the method further comprises the steps of:

[0055] Obtaining a design position to meet the clearance height between the overhead travelling crane 7 and the main cable 1 during the process of hoisting the cable clamp 8;

[0056] Obtain the tension that the temporary restraining device needs to provide when pulling the portal frame support cable 2 down to the designed position.

[0057] Furthermore, in this embodiment, obtaining the design position specifically includes:

[0058] Based on the stress-free cable length of the gantry support cable 2 between the main tower 11 and the bridge span centerline 5 and the preset coordinate point, the linear equation of the gantry support cable 2 at the preset coordinate point under the hoisting and traveling of the overhead crane 7 is obtained;

[0059] Based on the linear equation of the gantry support cable 2, the clearance height interval between the cable clamp 8 and the main cable 1 is extracted;

[0060] Similarly, the clearance height interval between the cable clamp 8 and the main cable 1 corresponding to different preset coordinate points is obtained;

[0061] Among multiple clearance height intervals, one is selected which satisfies the optimum clearance height between the overhead crane 7 and the main cable 1 during the process of hoisting the cable clamp 8, and the preset coordinate point corresponding to the optimum clearance height is set as the design position for pulling down the gantry support cable 2.

[0062] in, Figure 3 H shown is the clearance height between the overhead travelling crane 7 and the main cable 1 during the process of hoisting the cable clamp 8 .

[0063] That is to say, before obtaining the design position, it is necessary to set a plurality of preset coordinate points, and then obtain the clearance height intervals between the cable clamp 8 and the main cable 1 corresponding to different preset coordinate points, and then compare them; the optimal clearance height here refers to the minimum clearance height between the cable clamp 8 and the main cable 1 during the process of the overhead crane 7 lifting the cable clamp 8. It should also be noted that the clearance height refers to the clearance limit of the main cable 1 required during the process of the overhead crane 7 lifting the cable clamp 8. No components of the bridge span structure or other buildings shall intrude within the limit of the main cable 1 to ensure the safety of the overhead crane 7 during the process of lifting the cable clamp 8.

[0064] Furthermore, based on the stress-free cable length of the gantry support cable 2 between the main tower 11 and the bridge span centerline 5 and the preset coordinate points, the maximum horizontal force N of the gantry support cable 2 during the hoisting of the cable clamp 8 by the overhead crane 7 can also be obtained, and the pulling force required to be provided by the temporary restraint device when the gantry support cable 2 is pulled down to the designed position can be obtained, specifically including:

[0065] Based on the design position of the gantry support cable 2 being pulled down, the stress-free cable length of the gantry support cable 2 between the main tower 11 and the main tower 11 and the formula of the single-load suspension cable, the downward pulling force T required to pull the gantry support cable 2 down to the design position is obtained;

[0066] Based on the downward pulling force T, the maximum horizontal force N of the gantry support cable 2 during the process of the overhead crane 7 hoisting the cable clamp 8 and the mechanical equilibrium equation, the tensioning force of the inclined cable 4 and the tensioning force of the vertical cable 3 are obtained.

[0067] It should be noted that, in this embodiment, two inclined cables 4 are provided on the gantry support cables 2 between the main towers 11 and 11;

[0068] The horizontal force of the single inclined cable 4 balances the maximum horizontal force N of the portal frame support cable 2, and the vertical force of the two inclined cables 4 and the combined force of the vertical cable 3 balance the downward tension T.

[0069] Specifically, the tension force F1 (see Figure 5 As shown) satisfies the following formula: At the same time, the relationship between the downward pull force T and F1 and F2 is as follows: According to the calculation, the tension F2 provided by the vertical cable 3 of the temporary restraint device can be obtained, that is,

[0070] Therefore, when the portal frame support cable 2 is pulled down to the designed position, the tensioning force required to be provided by the inclined cable 4 is F1, and the tensioning force required to be provided by the vertical cable 3 is F2.

[0071] Therefore, a temporary restraint device is installed between the gantry supporting cable 2 and the main cable 1 to pull the gantry supporting cable 2 down to the designed position. Specifically, vertical cables 3 and oblique cables 4 are installed at the center line 5 of the bridge span of the gantry supporting cable 2 and between the gantry supporting cable 2 and the main cable 1. The oblique cables 4 are pulled down with a tension of F1, and the vertical cables 3 are pulled down with a tension of F2 to pull the gantry supporting cable 2 down to the designed position. The vertical cables 3 in the temporary restraint device are pre-tensioned to provide a restraint point for the gantry support cables 2, reducing the cable force and sag of the gantry support cables 2, and also allowing the half spans (① / ②) on both sides of the bridge span centerline 5 to form relatively independent working surfaces; the inclined cables 4 in the temporary restraint device are pre-tensioned to balance the horizontal force of the overhead crane 7 running on the gantry support cables 2; the vertical cables 3 and inclined cables 4 in the temporary restraint device are reliably connected to the main cables 1. It should be noted that when connecting the vertical cables 3 and the inclined cables 4 to the main cable 1, damage to the steel bundles of the main cable 1 should be avoided.

[0072] On the basis of the above embodiment, in this embodiment, in step 103 : the overhead travelling crane 7 for hoisting the cable clamp 8 is moved to the cable clamp design position on the main cable 1 by using a winch, and the cable clamp 8 is fixed to the main cable 1 .

[0073] Specifically, when the crane 7 for hoisting the cable clamp 8 is moved to the designed position of the cable clamp on the main cable 1 by a winch, the half spans on both sides of the center line 5 of the bridge span can be hoisted with the cable clamp 8 asynchronously at the same time, which can greatly shorten the construction period. Here, "simultaneously" means that the half spans on both sides of the center line 5 of the bridge span can be operated by the crane 7 to move the cable clamp 8 together; "asynchronously" means that when the half spans on both sides of the center line 5 of the bridge span are operated by the crane 7 to move the cable clamp 8 together, the positions of the cable clamps 8 on both sides of the center line 5 of the bridge span can be different.

[0074] The crane 7 for hoisting the cable clamp 8 is moved to the designed position of the cable clamp on the main cable 1 by a winch, and the cable clamp 8 is fixed to the main cable 1, which specifically includes steps 1031 to 1032:

[0075] Step 1031: using the winch and the winch wire rope 10, the overhead crane 7 for hoisting the cable clamp 8 is moved to the cable clamp design position on the main cable 1, and the cable clamp 8 is fixed to the main cable 1;

[0076] Step 1032: Use the chain hoist 9 to hoist, adjust and position the cable clamp 8.

[0077] Specifically, the winch and the winch wire rope 10 are used to pull the overhead crane 7 on the portal frame support cable 2 to hoist the cable clamps 8 in sequence. Here, "in sequence" means that after the winch and the winch wire rope 10 cooperate with the overhead crane 7 to hoist a cable clamp 8 to the cable clamp design position, the overhead crane 7 moves to the cable clamp 8 storage place again to transport the next cable clamp 8 to the cable clamp design position of the main cable 1 for hoisting, until all the cable clamps 8 are hoisted. The half spans (① / ②) on both sides of the bridge span centerline 5 can be hoisted with cable clamps 8 at the same time, and the chain hoist 9 is used for hoisting adjustment and positioning. By installing a temporary restraint device between the gantry support cable 2 and the main cable 1 in step 102, the gantry support cable 2 is pulled down to the designed position, thereby reducing the vertical deformation of the gantry support cable 2 when the overhead crane 7 runs on the gantry support cable 2 in step 103, reducing the clearance height between the overhead crane 7 and the main cable 1 during the process of lifting the cable clamp 8, lowering the aerial operating height of the guide chain hoist 9, reducing the number of guide chain hoists 9 in use, and facilitating the operation of the guide chain hoist 9.

[0078] After all the cable clamps 8 are installed, the temporarily fixed vertical cables 3 and inclined cables 4 are removed to complete the cable clamp hoisting construction, and then the subsequent structural construction can continue.

[0079] In summary, the suspension bridge cable clamp hoisting construction method of the present application has higher construction safety, simple construction method, quick and convenient operation, can improve construction efficiency, and is highly practical; when hoisting the cable clamp 8 on the main cable 1, the gantry support cables 2 on both sides of the bridge span centerline 5 are relatively independent and can be operated at the same time, which can greatly shorten the construction period; when installing the cable clamp 8 of the main cable 1, the span and cable force of the gantry support cable 2 are reduced, thereby reducing the vertical deformation of the gantry support cable 2 when the overhead crane 7 runs on the gantry support cable 2, reducing the aerial operating height of the guide chain hoist 9, and reducing the number of guide chain hoists 9 used, which is convenient for hoisting and installing the cable clamp 8.

[0080] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0081] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0082] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A suspension bridge cable clamp hoisting construction method, characterized in that: It includes: Carry out the installation of the main cable (1); A temporary restraining device is installed between the portal support cable (2) and the main cable (1), and the portal support cable (2) is pulled down to a designed position; Using a winch to move the overhead crane (7) for hoisting the cable clamp (8) to the designed position of the cable clamp on the main cable (1), and to fix the cable clamp (8) to the main cable (1); Remove temporary restraints.

2. The method for hoisting and installing a suspension bridge cable clamp according to claim 1, characterized in that: The temporary restraining device is arranged at the position of the bridge span center line (5) of the portal support cable (2); Pulling the portal frame support cable (2) down to the designed position specifically includes: pulling the portal frame support cable (2) down to the designed position at the position of the bridge span center line (5).

3. The method for hoisting and installing a suspension bridge cable clamp according to claim 2, characterized in that: When a crane (7) for hoisting a cable clamp (8) is moved to a designed position of the cable clamp on the main cable (1) by a winch, the cable clamps (8) can be hoisted asynchronously at the same time on the half spans on both sides of the center line (5) of the bridge span.

4. The method for hoisting and installing the cable clamp of a suspension bridge according to claim 1, characterized in that: Before installing a temporary restraining device between the portal support cable (2) and the main cable (1), the method further comprises: Obtaining a design position to satisfy the clearance height between the overhead travelling crane (7) and the main cable (1) during the process of hoisting the cable clamp (8); The tensile force required to be provided by the temporary restraining device when the portal frame supporting cable (2) is pulled down to the designed position is obtained.

5. The method for hoisting and installing the cable clamp of a suspension bridge according to claim 4, characterized in that: Get the design location, including: Based on the stress-free cable length of the gantry support cable (2) between the main tower (11) and the bridge span centerline (5) and the preset coordinate point, a linear equation of the gantry support cable (2) at the preset coordinate point under the hoisting movement of the overhead traveling crane (7) is obtained; Based on the linear equation of the gantry support cable (2), the clearance height interval between the cable clamp (8) and the main cable (1) is extracted; Similarly, the clearance height interval between the cable clamp (8) and the main cable (1) corresponding to different preset coordinate points is obtained; Among multiple clearance height intervals, an optimal clearance height between the overhead crane (7) and the main cable (1) is selected to meet the requirements of the cable clamp (8) during the hoisting process of the overhead crane (7), and a preset coordinate point corresponding to the optimal clearance height is set as the design position for pulling down the gantry support cable (2).

6. The method for hoisting and installing a cable clamp for a suspension bridge according to claim 5, characterized in that: Based on the stress-free cable length of the portal support cable (2) between the main tower (11) and the bridge span centerline (5) and the preset coordinate points, the maximum horizontal force N of the portal support cable (2) during the process of the overhead crane (7) hoisting the cable clamp (8) is also obtained.

7. The method for hoisting and installing a cable clamp for a suspension bridge according to claim 6, characterized in that: The temporary restraining device comprises: an inclined cable (4) and a vertical cable (3); The tensile force required to be provided by the temporary restraining device when pulling the portal frame support cable (2) down to the designed position is obtained, specifically including: Based on the design position of the portal support cable (2) being pulled down, the stress-free cable length of the portal support cable (2) between the main tower (11) and the formula of the single-load suspension cable, the downward pulling force T required for pulling the portal support cable (2) down to the design position is obtained; Based on the downward pulling force T, the maximum horizontal force N of the gantry support cable (2) during the process of the overhead crane (7) hoisting the cable clamp (8) and the mechanical equilibrium equation, the tensioning force of the inclined cable (4) and the tensioning force of the vertical cable (3) are obtained.

8. The method for hoisting and installing a suspension bridge cable clamp according to claim 7, characterized in that: Two inclined cables (4) are arranged on the portal support cables (2) between the main towers (11) and the main towers (11); The horizontal force of a single inclined cable (4) balances the maximum horizontal force N of the portal frame support cable (2), and the vertical force of the two inclined cables (4) and the combined force of the vertical cable (3) balance the downward tension T.

9. The method for hoisting and installing the cable clamp of a suspension bridge according to claim 1, characterized in that: The crane (7) for hoisting the cable clamp (8) is moved to the designed position of the cable clamp on the main cable (1) by using a winch, and the cable clamp (8) is fixed to the main cable (1), which specifically includes: Using a winch and a winch wire rope (10), a crane (7) for hoisting a cable clamp (8) is moved to a designed position of the cable clamp on the main cable (1); The chain hoist (9) is used to adjust and position the cable clamp (8).

Images